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 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


#include <gtk/gtk.h>

#include "vikwindow.h"
#include "viklayerspanel.h"
#include "vikviewport.h"

typedef struct _VikDataSourceInterface VikDataSourceInterface;

/* global data structure used to expose the progress dialog to the worker thread */
typedef struct {
  GtkWidget *status;
  VikWindow *vw;
  VikLayersPanel *vlp;
  VikViewport *vvp;
  GtkWidget *dialog;
  gboolean ok; /* if OK is false when we exit, we MUST free w */
  VikDataSourceInterface *interface;
  gpointer user_data;
} acq_dialog_widgets_t;

typedef enum { VIK_DATASOURCE_GPSBABEL_DIRECT, VIK_DATASOURCE_SHELL_CMD } vik_datasource_type_t;

/* returns pointer to state if OK, otherwise NULL */
typedef gpointer (*VikDataSourceInitFunc) ();

/* returns NULL if OK, otherwise returns an error message. */
typedef gchar *(*VikDataSourceCheckExistenceFunc) ();

/* Create widgets to show in a setup dialog, set up state via user_data */
typedef void (*VikDataSourceAddSetupWidgetsFunc) ( GtkWidget *dialog, VikViewport *vvp, gpointer user_data );

/* if VIK_DATASOURCE_GPSBABEL_DIRECT, babelargs and inputfile.
   if VIK_DATASOURCE_SHELL_CMD, shellcmd and inputtype.
   set both to NULL to signal refusal (ie already downloading) */
typedef void (*VikDataSourceGetCmdStringFunc) ( gpointer user_data, gchar **babelargs_or_shellcmd, gchar **inputfile_or_inputtype );

/* */
typedef void  (*VikDataSourceProgressFunc)  (gpointer c, gpointer data, acq_dialog_widgets_t *w);

/* Creates widgets to show in a progress dialog, may set up state via user_data */
typedef void  (*VikDataSourceAddProgressWidgetsFunc) ( GtkWidget *dialog, gpointer user_data );

/* Frees any widgets created for the setup or progress dialogs, any allocated state, etc. */
typedef void (*VikDataSourceCleanupFunc) ( gpointer user_data );

struct _VikDataSourceInterface {
  const gchar *window_title;
  const gchar *layer_title;
  vik_datasource_type_t type;
  vik_datasource_type_t mode;

  VikDataSourceInitFunc init_func;
  VikDataSourceCheckExistenceFunc check_existence_func;
  VikDataSourceAddSetupWidgetsFunc add_setup_widgets_func;      
  VikDataSourceGetCmdStringFunc get_cmd_string_func; 

  VikDataSourceProgressFunc progress_func;
  VikDataSourceAddProgressWidgetsFunc add_progress_widgets_func;
  VikDataSourceCleanupFunc cleanup_func;

void a_acquire ( VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp, VikDataSourceInterface *interface );


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